Heat transformation based on CaCl2/H2O - Part A: Closed operation principle

Thermochemical systems based on gas-solid-reactions enable both storage of thermal energy and its thermal upgrade by heat transformation. Thus, they are an interesting and promising option in order to reutilize industrial waste heat and reduce primary energy consumption. In this publication an experimental analysis of the reaction system calcium chloride and water vapor is presented. The endothermic dehydration reaction is used in order to charge the storage at 130 °C while the reverse reaction leads to a discharging at 165 °C. Thus, a thermal upgrade by 35 K could be demonstrated and main limitations by heat and mass transfer were analyzed. Whereas this part focusses on a closed operation principle, the associated part B deals with the open operation utilizing air as purge gas.